Millions of Americans will vote on Tuesday to decide whether Vice President Kamala Harris or former President Donald Trump will be the country's next leader.
Polls ahead of Election Day point to a tight race, especially in a group of battleground states that will be key to deciding the winner.
Both candidates made their final speeches to voters Monday in the same part of Pennsylvania at roughly the same time, capping the final day of the presidential campaign in a state that could be decisive in today's election.
"Tomorrow is election day and the momentum is on our side," Ms Harris told her supporters gathered at a historic steel mill. "Our campaign has touched the ambitions, aspirations and dreams of the American people. And we know it's time for a new generation of leadership in America."
"We have to come out strong," Ms Harris added. "...We will win."
Mr Trump, addressing supporters at a sports arena, said another administration of his would "start the most extraordinary economic explosion the world has ever seen".
"If you vote for Kamala, you're going to have four more years of misery, failure and disaster," Trump said. “Our country may never recover. Vote for me and I will bring rising wages, rising incomes and a colossal increase in jobs, wealth and opportunity to America of every race, religion, color and creed. To each of them".
Before Election Day on Tuesday, more than 81 million Americans voted early, either in person at the polls or by mail.
That's a total of more than half of the 158 million who voted in the 2020 election, when President Joe Biden defeated Mr. Trump. It was a democratic victory that to this day Mr. Trump says was based on fraud.
Dozens of court rulings, often by Mr. Trump's own appointed judges, have gone against him as he tried to challenge the 2020 results. But on Sunday, he told a rally in Pennsylvania that he "shouldn't have walked away" from The White House in 2021, when Mr. Biden took office.
Mr Trump has said he will accept Tuesday's result only if he concludes the election was conducted fairly, which Democratic critics say will only mean if he wins. Both Mr. Trump and Ms. Harris have assembled large teams of lawyers for legal battles if there is no clear winner.
A victory for Mr Trump would make him the second president to serve two non-consecutive terms, after President Grover Cleveland in the 1880s. He would also be the first to serve as president while awaiting sentencing later in November , after pleading guilty to 34 charges related to his payment of a movie star to an adult before his successful 2016 run.
Mr. Trump has often run through his campaign with outbursts of anger against Democratic opponents, calling them "domestic enemies" and a threat to the country's future. He has dismissed Ms Harris as a person of limited intellect and said she would be a pawn to other world leaders in handling international relations.
Ms Harris says she expects to become the country's 47th president. If elected, she will be the first woman to serve as US leader, the first of South Asian descent and the second black president after Barack Obama.
She has described Mr Trump as a "frivolous man", saying he would be a threat to American democracy and immune from any presidential restrictions, after the US Supreme Court ruled earlier this year that presidents cannot may be prosecuted for any wrongdoing related to their official actions.
Pollsters say voters are deeply divided between the two candidates. Recent polls show the race is even in the battleground states.
An ABC News poll shows Mr. Trump likely to win five of the seven battleground states, but The Washington Post says its polls put Ms. Harris ahead in four. The New York Times says Mr. Trump leads in four states, Ms. Harris in two and the race is tied in Pennsylvania.
The winner of the US presidential election is not decided by the national popular vote, but through the Electoral College. Forty-eight of the states award all of their electoral votes to the winner in those states. Two states – Maine and Nebraska – split electoral votes based on the outcome.
The number of electoral votes in each state is based on population, so the largest states exert the greatest influence in determining the overall national outcome. The winner needs 270 of the 538 electoral votes to secure the presidency. Pennsylvania alone has 19 electoral votes.
Polls show both Ms. Harris and Mr. Trump with significant leads in 43 of the states, enough for each to secure 200 electoral votes or more. The winner will be decided in the remaining seven battleground states, where both Ms. Harris and Mr. Trump have held frequent rallies but ignored the rest of the country during the campaign./ VOA